School-slate



c. F. RAPE. SCHOOL SLATE.

. (No Model.)

No. 289,711. Patented D60. 4, .1883.

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UNTTED STATES PATE T ()FFICE.

CHRISTIAN F. RAPI, OF CINCINNATI, OHIO.

SCHOOL-SLATE.

SFECIFICATION formingpart of Letters Patent No. 289,711, dated December 4, 1883.

Application filed April 16, 1883. (No model.)

To aZZ whom, it may concern.-

Be it known that I, CHRISTIAN F. RAPP, a citizenof the United States, residing at Gincinnati, county of Hamilton, State of Ohio,

have invented certain new and useful Improvements in School-Slates, of which the following is a specification.

The object of this invention is a cheap means of muffling the frames of slates, so as to render them noiseless.

\Vith this obj ect in view, my invention consists in amufiler which can be readily attached to any of the slates now in common use. It also consists of a peculiar method of applying my mufiling material to double reversible slates.

The invention will be first fully described in connection with the accompanying drawings, and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a view looking at the hinge edge of my double reversible slate, with a portion of the muffling material broken away to clearly show the mode of securing the wire linlehinge. Fig. 2 is a plan view of a singleslate frame muffled with reps or ribbed material. Fig. 3 is a plan view of a piece of the muffiing material; and Fig. 4 is a transverse section through the frame, showing the mode of stretching and securing the muffler around the edge.

Similar referen ce-letters throughout the various views indicate identical parts.

A represents the ordinary slate-frames, which have rounded edges and corners; and B, the coupling-link used to hinge a pair of frames together. The link B is shown embedded in grooves in the edge of the frames and held in place by staples. The frames are transversely grooved where the ends of the link extend from one frame to the other. The frames and coupling-hinge here illustrated arewell known, and are the same as are illustrated in my Patent No.- 186,621, of January 23, 1877.

The muffling material C is a band or strip of cloth or similar goods, of sufficient width to cover the edges of the frame and extend a short distance over on the sides. In the edges of this material are woven or otherwise secured strands of wire D, the purpose of which is to draw the edges of the material down upon the sides of the frame and hold it firmly in place.

I use wire in preference to cord or elastic material, as it is more rigid, and the scholars cannot sever it as easily.

To cover or mufiie single slates, a strip of the material C of proper length is drawn tightly around the edge of the frame, and the oppo site ends of the wire, upon each side of the frame,'are twisted together, thereby drawing the edges down tightly and making the material closely fit the frame. After the wires are drawn sufficiently tight, the twisted ends are passed through a perforation, a, 'in the end piece of the frame, and a peg, a, driven in to hold them firmly. The projecting ends of the wires and peg are nipped off even with the face of the frame and the ends of the goods sewed together, thus completing the frame. To more securely fasten the material in place, gimp-tacks or small wire staples may be driven in near the edge.

In applying my muffler to any hinged double slates, as represented in Fig. 1, I proceed as follows: I first make openings or perforations in the strips of muffling material at the points where the wire link-hinge B is to pass through them. This I do with a sharp-pointed instrument, so as not to fracture the threads of the muffling material. Then the free ends of the link B are passed through these perforations in two strips of the muffling material, of suitable length to extend around the frames.

Each strip of the material is arranged upon opposite sides of the link, as shown in Fig. 1. The link is then placed in grooves of the frames and secured by the staples b, or in any suitable manner. stretched around the frames and secured, in the After this the material C is same manner as before described, upon the single frames. the frames should be of sufficient depth to embed the link and the securing-staple.

The material I prefer to use has transverse ribs or cords, as shown in Figs. 2 and 3, woven in the goods in the course of manufacture; or

plain goods may be used with cord braided or stitched transversely or in a zigzag line upon its exterior, to protect it from wear and make a noiseless cushion.

My muffling material may be used with any of the double or single slates now #in use, and should it become worn or soiled it might be The grooves in the edges of 0 removed and the slate used without it, as its attachment does not disfigure the frames.

VVhatI claim as new, and desire to secure by Letters Patent, is-

1. A muffling material for slate-frames, consisting of strip 0 and tightening-wires D, the tighteners D being secured in the edges of the strip, for the purpose of stretching the material to the shape of the frame and retaining it in place, substantially as specified.

2. A muffling material for slate-frames, consisting of strip 0, having transversely-raised ribs, and tightencrs D, the tighteners being secured in the edges of the strip, for the purpose of stretching the material to the shape of the frame and retaining it in place, the raised ribs being for the purpose of deadening the sound and protecting the material, as specified.

3. In a school-slate, the combination, sub- 20 stantially as specified, of the frame A with muffling material C and tightening-wires D, said muffler being stretched around the edge and part of the sides of the frame by the tighteners D and secured to the frame, in the manner described.

4. In a double-hinged slate, the combination, substantially as specified, of a pair of frames, A A, having .muffling material C 1 stretched around and secured there by wires 0 D, with a coupling-hinge, as B, to unite the said frames, so that they may fold upon each other in either direction.

CHRISTIAN F. RAPP.

W'i tnesses:

JACOB J. GEssERT, ALFRED B. BENEDICT. 

